Peder Johnson's 1st Levelpack
Peder Johnson's 1st Levelpack contains only one custom Keen 1 level, which is set as level 10. It requires collecting keycards and some backtracking. Part of the level is formed to represent the author's name. The level was present in the KMO Default Levels pack. Levels 11-16 from the original game is contained within the download link.
Spoiler warning! This shows the whole levels.